<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>

</head>

<body>

  <div id="app">
    <button @click="changeIsShow">切换</button>
    <button @click="addAge">添加</button>
    <img v-show="isShow" src="./img/monkey.gif" alt="">
      <img v-show="age>=18" src="./img/monkey.gif" alt="">
    <div>
      <!-- 开发环境版本，包含了有帮助的命令行警告 -->
      <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
      <script>
        var app = new Vue({
          el: "#app",
          data: {
            isShow:false,
            age:17
          },
          methods: {
           changeIsShow:function(){
             this.isShow=!this.isShow;
           },addAge:function(){
             this.age++;
           }
          }
        })
      </script>
</body>

</html>